Appearing in the background of television shows scrawled on chalkboards and in the introduction of Bill Nye The Science Guy, Einstein’s equation E=mc² is one of the most widely known equations in the world. Many people may not fully understand the meaning behind Einstein’s most famous equation, but they remember it due to its brevity. Today, we’d like to introduce you to the equation’s relativistic form: E²=(mc²)² + (pc)²